Plant Protection Update #16

Fruit

Plum Culculio damage is quite evident now as half-moon scars on the fruit and/or sap oozing from a wound on the side of the fruit. Plum Curculio is quite common especially in unsprayed trees and on trees next to old unsprayed trees. Plum Culculio will feed on apple, peach, plum, pear, and nectarines. The female will leave a 1/8" scar on the fruit in the shape of a half-moon when she lays eggs. The scar will remain even if the larvae fails to develop. The only remedy is to follow the spray schedule in PMG 018 pg. 66 and 67. For backyard growers trying to get away with a reduced spraying - often just the two sprays just after petal fall will do a good job of controlling this pest.

Green June Beetles are not flying statewide yet but should soon. They are generally minor turf pests but will sometimes damage fruit and ornamentals. Sevin 50W can be used up to 1 day from harvest and will give control of these beetles if they are damaging the fruit. Sevin can also be used on most ornamentals (check the label.....)

Turf

I should have knocked on wood last week when I noted that no Japanese beetles have been observed. Now they are everywhere but seem to be in low numbers.

Ornamentals

Spruce Aphid damage may be apparent now. These aphids feed during the late winter and early spring and cause the needles to fall out of the bottom center of the tree and can cause yellowing and browning of needles remaining on the tree. The aphids cast skins should be apparent on the bark of the twigs. Treat in late spring when aphid are present.

Vegetable/Field Crops

Asiatic Garden Beetles (small reddish brown "June beetles") will damage a lot of vegetable and field crops this time of year. Most often the damage is minor but can be cleared up with Sevin if damage is objectionable.


Eric Day
Insect Identification Laboratory
Department of Entomology
308 Price Hall
Virginia Polytechnic Institute and State University
Blacksburg, VA 24061-0319
(W) 540-231-4899
Fax 540-231-9131

idlab@vt.edu

See my lab homepage:

http://www.ento.vt.edu/Facilities/OnCampus/IDInfo.html